He did need subbing after about an hour but I guess Roberto looked at his bench and thought:
McGeady- wouldn't last more than about 20 minutes and, if we moved Mirallas inside to accommodate him, we'd lose Kev's threat from the wing, we'd lose our balance and we the Belgian probably wouldn't pass to anyone or help out defensively.
Naismith- not one of the best passers in the squad.
Vellios- not someone who he has a lot of faith in and it would be a bold move to switch to 4-4-2 when we were winning 1-0.
I think I'd probably have gone with Tolos to try and push them back though, because they seemed to sense that we didn't know whether to stick or twist and that, if they pushed forward, we wouldn't take advantage.